The operators in Prudhoe Bay, Alaska have over a decade of experience using coiled tubing units to reenter producing oil wells through the tubing to drill laterals up to 3,000 feet to substantially sustain production. To date, over 500 such laterals have been drilled; over 100 are slimhole out of 3 ? inch casing or liner in which a 2 3/8-inch liner is set. There have been a number of SPE papers documenting the CT drilling activities in Alaska. Selected papers on the drilling activities are listed below.